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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a>
<span class="sourceLineNo">003</span> * contributor license agreements.  See the NOTICE file distributed with<a name="line.3"></a>
<span class="sourceLineNo">004</span> * this work for additional information regarding copyright ownership.<a name="line.4"></a>
<span class="sourceLineNo">005</span> * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.5"></a>
<span class="sourceLineNo">006</span> * (the "License"); you may not use this file except in compliance with<a name="line.6"></a>
<span class="sourceLineNo">007</span> * the License.  You may obtain a copy of the License at<a name="line.7"></a>
<span class="sourceLineNo">008</span> *<a name="line.8"></a>
<span class="sourceLineNo">009</span> *      http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a>
<span class="sourceLineNo">010</span> *<a name="line.10"></a>
<span class="sourceLineNo">011</span> * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a>
<span class="sourceLineNo">012</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a>
<span class="sourceLineNo">013</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a>
<span class="sourceLineNo">014</span> * See the License for the specific language governing permissions and<a name="line.14"></a>
<span class="sourceLineNo">015</span> * limitations under the License.<a name="line.15"></a>
<span class="sourceLineNo">016</span> */<a name="line.16"></a>
<span class="sourceLineNo">017</span><a name="line.17"></a>
<span class="sourceLineNo">018</span>package org.apache.commons.net.tftp;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>import java.io.IOException;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.io.InputStream;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.io.InterruptedIOException;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.io.OutputStream;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.net.InetAddress;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.net.SocketException;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.net.UnknownHostException;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import org.apache.commons.net.io.FromNetASCIIOutputStream;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import org.apache.commons.net.io.ToNetASCIIInputStream;<a name="line.28"></a>
<span class="sourceLineNo">029</span><a name="line.29"></a>
<span class="sourceLineNo">030</span>/***<a name="line.30"></a>
<span class="sourceLineNo">031</span> * The TFTPClient class encapsulates all the aspects of the TFTP protocol<a name="line.31"></a>
<span class="sourceLineNo">032</span> * necessary to receive and send files through TFTP.  It is derived from<a name="line.32"></a>
<span class="sourceLineNo">033</span> * the {@link org.apache.commons.net.tftp.TFTP} because<a name="line.33"></a>
<span class="sourceLineNo">034</span> * it is more convenient than using aggregation, and as a result exposes<a name="line.34"></a>
<span class="sourceLineNo">035</span> * the same set of methods to allow you to deal with the TFTP protocol<a name="line.35"></a>
<span class="sourceLineNo">036</span> * directly.  However, almost every user should only be concerend with the<a name="line.36"></a>
<span class="sourceLineNo">037</span> * the {@link org.apache.commons.net.DatagramSocketClient#open  open() },<a name="line.37"></a>
<span class="sourceLineNo">038</span> * {@link org.apache.commons.net.DatagramSocketClient#close  close() },<a name="line.38"></a>
<span class="sourceLineNo">039</span> * {@link #sendFile  sendFile() }, and<a name="line.39"></a>
<span class="sourceLineNo">040</span> * {@link #receiveFile  receiveFile() } methods.  Additionally, the<a name="line.40"></a>
<span class="sourceLineNo">041</span> * {@link #setMaxTimeouts  setMaxTimeouts() } and<a name="line.41"></a>
<span class="sourceLineNo">042</span> * {@link org.apache.commons.net.DatagramSocketClient#setDefaultTimeout setDefaultTimeout() }<a name="line.42"></a>
<span class="sourceLineNo">043</span> *  methods may be of importance for performance<a name="line.43"></a>
<span class="sourceLineNo">044</span> * tuning.<a name="line.44"></a>
<span class="sourceLineNo">045</span> * &lt;p&gt;<a name="line.45"></a>
<span class="sourceLineNo">046</span> * Details regarding the TFTP protocol and the format of TFTP packets can<a name="line.46"></a>
<span class="sourceLineNo">047</span> * be found in RFC 783.  But the point of these classes is to keep you<a name="line.47"></a>
<span class="sourceLineNo">048</span> * from having to worry about the internals.<a name="line.48"></a>
<span class="sourceLineNo">049</span> * &lt;p&gt;<a name="line.49"></a>
<span class="sourceLineNo">050</span> * &lt;p&gt;<a name="line.50"></a>
<span class="sourceLineNo">051</span> * @see TFTP<a name="line.51"></a>
<span class="sourceLineNo">052</span> * @see TFTPPacket<a name="line.52"></a>
<span class="sourceLineNo">053</span> * @see TFTPPacketException<a name="line.53"></a>
<span class="sourceLineNo">054</span> ***/<a name="line.54"></a>
<span class="sourceLineNo">055</span><a name="line.55"></a>
<span class="sourceLineNo">056</span>public class TFTPClient extends TFTP<a name="line.56"></a>
<span class="sourceLineNo">057</span>{<a name="line.57"></a>
<span class="sourceLineNo">058</span>    /***<a name="line.58"></a>
<span class="sourceLineNo">059</span>     * The default number of times a receive attempt is allowed to timeout<a name="line.59"></a>
<span class="sourceLineNo">060</span>     * before ending attempts to retry the receive and failing.  The default<a name="line.60"></a>
<span class="sourceLineNo">061</span>     * is 5 timeouts.<a name="line.61"></a>
<span class="sourceLineNo">062</span>     ***/<a name="line.62"></a>
<span class="sourceLineNo">063</span>    public static final int DEFAULT_MAX_TIMEOUTS = 5;<a name="line.63"></a>
<span class="sourceLineNo">064</span><a name="line.64"></a>
<span class="sourceLineNo">065</span>    /*** The maximum number of timeouts allowed before failing. ***/<a name="line.65"></a>
<span class="sourceLineNo">066</span>    private int __maxTimeouts;<a name="line.66"></a>
<span class="sourceLineNo">067</span><a name="line.67"></a>
<span class="sourceLineNo">068</span>    /***<a name="line.68"></a>
<span class="sourceLineNo">069</span>     * Creates a TFTPClient instance with a default timeout of DEFAULT_TIMEOUT,<a name="line.69"></a>
<span class="sourceLineNo">070</span>     * maximum timeouts value of DEFAULT_MAX_TIMEOUTS, a null socket,<a name="line.70"></a>
<span class="sourceLineNo">071</span>     * and buffered operations disabled.<a name="line.71"></a>
<span class="sourceLineNo">072</span>     ***/<a name="line.72"></a>
<span class="sourceLineNo">073</span>    public TFTPClient()<a name="line.73"></a>
<span class="sourceLineNo">074</span>    {<a name="line.74"></a>
<span class="sourceLineNo">075</span>        __maxTimeouts = DEFAULT_MAX_TIMEOUTS;<a name="line.75"></a>
<span class="sourceLineNo">076</span>    }<a name="line.76"></a>
<span class="sourceLineNo">077</span><a name="line.77"></a>
<span class="sourceLineNo">078</span>    /***<a name="line.78"></a>
<span class="sourceLineNo">079</span>     * Sets the maximum number of times a receive attempt is allowed to<a name="line.79"></a>
<span class="sourceLineNo">080</span>     * timeout during a receiveFile() or sendFile() operation before ending<a name="line.80"></a>
<span class="sourceLineNo">081</span>     * attempts to retry the receive and failing.<a name="line.81"></a>
<span class="sourceLineNo">082</span>     * The default is DEFAULT_MAX_TIMEOUTS.<a name="line.82"></a>
<span class="sourceLineNo">083</span>     * &lt;p&gt;<a name="line.83"></a>
<span class="sourceLineNo">084</span>     * @param numTimeouts  The maximum number of timeouts to allow.  Values<a name="line.84"></a>
<span class="sourceLineNo">085</span>     *        less than 1 should not be used, but if they are, they are<a name="line.85"></a>
<span class="sourceLineNo">086</span>     *        treated as 1.<a name="line.86"></a>
<span class="sourceLineNo">087</span>     ***/<a name="line.87"></a>
<span class="sourceLineNo">088</span>    public void setMaxTimeouts(int numTimeouts)<a name="line.88"></a>
<span class="sourceLineNo">089</span>    {<a name="line.89"></a>
<span class="sourceLineNo">090</span>        if (numTimeouts &lt; 1) {<a name="line.90"></a>
<span class="sourceLineNo">091</span>            __maxTimeouts = 1;<a name="line.91"></a>
<span class="sourceLineNo">092</span>        } else {<a name="line.92"></a>
<span class="sourceLineNo">093</span>            __maxTimeouts = numTimeouts;<a name="line.93"></a>
<span class="sourceLineNo">094</span>        }<a name="line.94"></a>
<span class="sourceLineNo">095</span>    }<a name="line.95"></a>
<span class="sourceLineNo">096</span><a name="line.96"></a>
<span class="sourceLineNo">097</span>    /***<a name="line.97"></a>
<span class="sourceLineNo">098</span>     * Returns the maximum number of times a receive attempt is allowed to<a name="line.98"></a>
<span class="sourceLineNo">099</span>     * timeout before ending attempts to retry the receive and failing.<a name="line.99"></a>
<span class="sourceLineNo">100</span>     * &lt;p&gt;<a name="line.100"></a>
<span class="sourceLineNo">101</span>     * @return The maximum number of timeouts allowed.<a name="line.101"></a>
<span class="sourceLineNo">102</span>     ***/<a name="line.102"></a>
<span class="sourceLineNo">103</span>    public int getMaxTimeouts()<a name="line.103"></a>
<span class="sourceLineNo">104</span>    {<a name="line.104"></a>
<span class="sourceLineNo">105</span>        return __maxTimeouts;<a name="line.105"></a>
<span class="sourceLineNo">106</span>    }<a name="line.106"></a>
<span class="sourceLineNo">107</span><a name="line.107"></a>
<span class="sourceLineNo">108</span><a name="line.108"></a>
<span class="sourceLineNo">109</span>    /***<a name="line.109"></a>
<span class="sourceLineNo">110</span>     * Requests a named file from a remote host, writes the<a name="line.110"></a>
<span class="sourceLineNo">111</span>     * file to an OutputStream, closes the connection, and returns the number<a name="line.111"></a>
<span class="sourceLineNo">112</span>     * of bytes read.  A local UDP socket must first be created by<a name="line.112"></a>
<span class="sourceLineNo">113</span>     * {@link org.apache.commons.net.DatagramSocketClient#open open()} before<a name="line.113"></a>
<span class="sourceLineNo">114</span>     * invoking this method.  This method will not close the OutputStream<a name="line.114"></a>
<span class="sourceLineNo">115</span>     * containing the file; you must close it after the method invocation.<a name="line.115"></a>
<span class="sourceLineNo">116</span>     * &lt;p&gt;<a name="line.116"></a>
<span class="sourceLineNo">117</span>     * @param filename  The name of the file to receive.<a name="line.117"></a>
<span class="sourceLineNo">118</span>     * @param mode   The TFTP mode of the transfer (one of the MODE constants).<a name="line.118"></a>
<span class="sourceLineNo">119</span>     * @param output The OutputStream to which the file should be written.<a name="line.119"></a>
<span class="sourceLineNo">120</span>     * @param host   The remote host serving the file.<a name="line.120"></a>
<span class="sourceLineNo">121</span>     * @param port   The port number of the remote TFTP server.<a name="line.121"></a>
<span class="sourceLineNo">122</span>     * @exception IOException If an I/O error occurs.  The nature of the<a name="line.122"></a>
<span class="sourceLineNo">123</span>     *            error will be reported in the message.<a name="line.123"></a>
<span class="sourceLineNo">124</span>     ***/<a name="line.124"></a>
<span class="sourceLineNo">125</span>    public int receiveFile(String filename, int mode, OutputStream output,<a name="line.125"></a>
<span class="sourceLineNo">126</span>                           InetAddress host, int port) throws IOException<a name="line.126"></a>
<span class="sourceLineNo">127</span>    {<a name="line.127"></a>
<span class="sourceLineNo">128</span>        int bytesRead, timeouts, lastBlock, block, hostPort, dataLength;<a name="line.128"></a>
<span class="sourceLineNo">129</span>        TFTPPacket sent, received = null;<a name="line.129"></a>
<span class="sourceLineNo">130</span>        TFTPErrorPacket error;<a name="line.130"></a>
<span class="sourceLineNo">131</span>        TFTPDataPacket data;<a name="line.131"></a>
<span class="sourceLineNo">132</span>        TFTPAckPacket ack = new TFTPAckPacket(host, port, 0);<a name="line.132"></a>
<span class="sourceLineNo">133</span><a name="line.133"></a>
<span class="sourceLineNo">134</span>        beginBufferedOps();<a name="line.134"></a>
<span class="sourceLineNo">135</span><a name="line.135"></a>
<span class="sourceLineNo">136</span>        dataLength = lastBlock = hostPort = bytesRead = 0;<a name="line.136"></a>
<span class="sourceLineNo">137</span>        block = 1;<a name="line.137"></a>
<span class="sourceLineNo">138</span><a name="line.138"></a>
<span class="sourceLineNo">139</span>        if (mode == TFTP.ASCII_MODE) {<a name="line.139"></a>
<span class="sourceLineNo">140</span>            output = new FromNetASCIIOutputStream(output);<a name="line.140"></a>
<span class="sourceLineNo">141</span>        }<a name="line.141"></a>
<span class="sourceLineNo">142</span><a name="line.142"></a>
<span class="sourceLineNo">143</span>        sent =<a name="line.143"></a>
<span class="sourceLineNo">144</span>            new TFTPReadRequestPacket(host, port, filename, mode);<a name="line.144"></a>
<span class="sourceLineNo">145</span><a name="line.145"></a>
<span class="sourceLineNo">146</span>_sendPacket:<a name="line.146"></a>
<span class="sourceLineNo">147</span>        do<a name="line.147"></a>
<span class="sourceLineNo">148</span>        {<a name="line.148"></a>
<span class="sourceLineNo">149</span>            bufferedSend(sent);<a name="line.149"></a>
<span class="sourceLineNo">150</span><a name="line.150"></a>
<span class="sourceLineNo">151</span>_receivePacket:<a name="line.151"></a>
<span class="sourceLineNo">152</span>            while (true)<a name="line.152"></a>
<span class="sourceLineNo">153</span>            {<a name="line.153"></a>
<span class="sourceLineNo">154</span>                timeouts = 0;<a name="line.154"></a>
<span class="sourceLineNo">155</span>                do {<a name="line.155"></a>
<span class="sourceLineNo">156</span>                    try<a name="line.156"></a>
<span class="sourceLineNo">157</span>                    {<a name="line.157"></a>
<span class="sourceLineNo">158</span>                        received = bufferedReceive();<a name="line.158"></a>
<span class="sourceLineNo">159</span>                        break;<a name="line.159"></a>
<span class="sourceLineNo">160</span>                    }<a name="line.160"></a>
<span class="sourceLineNo">161</span>                    catch (SocketException e)<a name="line.161"></a>
<span class="sourceLineNo">162</span>                    {<a name="line.162"></a>
<span class="sourceLineNo">163</span>                        if (++timeouts &gt;= __maxTimeouts)<a name="line.163"></a>
<span class="sourceLineNo">164</span>                        {<a name="line.164"></a>
<span class="sourceLineNo">165</span>                            endBufferedOps();<a name="line.165"></a>
<span class="sourceLineNo">166</span>                            throw new IOException("Connection timed out.");<a name="line.166"></a>
<span class="sourceLineNo">167</span>                        }<a name="line.167"></a>
<span class="sourceLineNo">168</span>                        continue _sendPacket;<a name="line.168"></a>
<span class="sourceLineNo">169</span>                    }<a name="line.169"></a>
<span class="sourceLineNo">170</span>                    catch (InterruptedIOException e)<a name="line.170"></a>
<span class="sourceLineNo">171</span>                    {<a name="line.171"></a>
<span class="sourceLineNo">172</span>                        if (++timeouts &gt;= __maxTimeouts)<a name="line.172"></a>
<span class="sourceLineNo">173</span>                        {<a name="line.173"></a>
<span class="sourceLineNo">174</span>                            endBufferedOps();<a name="line.174"></a>
<span class="sourceLineNo">175</span>                            throw new IOException("Connection timed out.");<a name="line.175"></a>
<span class="sourceLineNo">176</span>                        }<a name="line.176"></a>
<span class="sourceLineNo">177</span>                        continue _sendPacket;<a name="line.177"></a>
<span class="sourceLineNo">178</span>                    }<a name="line.178"></a>
<span class="sourceLineNo">179</span>                    catch (TFTPPacketException e)<a name="line.179"></a>
<span class="sourceLineNo">180</span>                    {<a name="line.180"></a>
<span class="sourceLineNo">181</span>                        endBufferedOps();<a name="line.181"></a>
<span class="sourceLineNo">182</span>                        throw new IOException("Bad packet: " + e.getMessage());<a name="line.182"></a>
<span class="sourceLineNo">183</span>                    }<a name="line.183"></a>
<span class="sourceLineNo">184</span>                } while (timeouts &lt; __maxTimeouts); // __maxTimeouts &gt;=1 so will always do loop at least once<a name="line.184"></a>
<span class="sourceLineNo">185</span><a name="line.185"></a>
<span class="sourceLineNo">186</span>                // The first time we receive we get the port number and<a name="line.186"></a>
<span class="sourceLineNo">187</span>                // answering host address (for hosts with multiple IPs)<a name="line.187"></a>
<span class="sourceLineNo">188</span>                if (lastBlock == 0)<a name="line.188"></a>
<span class="sourceLineNo">189</span>                {<a name="line.189"></a>
<span class="sourceLineNo">190</span>                    hostPort = received.getPort();<a name="line.190"></a>
<span class="sourceLineNo">191</span>                    ack.setPort(hostPort);<a name="line.191"></a>
<span class="sourceLineNo">192</span>                    if(!host.equals(received.getAddress()))<a name="line.192"></a>
<span class="sourceLineNo">193</span>                    {<a name="line.193"></a>
<span class="sourceLineNo">194</span>                        host = received.getAddress();<a name="line.194"></a>
<span class="sourceLineNo">195</span>                        ack.setAddress(host);<a name="line.195"></a>
<span class="sourceLineNo">196</span>                        sent.setAddress(host);<a name="line.196"></a>
<span class="sourceLineNo">197</span>                    }<a name="line.197"></a>
<span class="sourceLineNo">198</span>                }<a name="line.198"></a>
<span class="sourceLineNo">199</span><a name="line.199"></a>
<span class="sourceLineNo">200</span>                // Comply with RFC 783 indication that an error acknowledgment<a name="line.200"></a>
<span class="sourceLineNo">201</span>                // should be sent to originator if unexpected TID or host.<a name="line.201"></a>
<span class="sourceLineNo">202</span>                if (host.equals(received.getAddress()) &amp;&amp;<a name="line.202"></a>
<span class="sourceLineNo">203</span>                        received.getPort() == hostPort)<a name="line.203"></a>
<span class="sourceLineNo">204</span>                {<a name="line.204"></a>
<span class="sourceLineNo">205</span><a name="line.205"></a>
<span class="sourceLineNo">206</span>                    switch (received.getType())<a name="line.206"></a>
<span class="sourceLineNo">207</span>                    {<a name="line.207"></a>
<span class="sourceLineNo">208</span>                    case TFTPPacket.ERROR:<a name="line.208"></a>
<span class="sourceLineNo">209</span>                        error = (TFTPErrorPacket)received;<a name="line.209"></a>
<span class="sourceLineNo">210</span>                        endBufferedOps();<a name="line.210"></a>
<span class="sourceLineNo">211</span>                        throw new IOException("Error code " + error.getError() +<a name="line.211"></a>
<span class="sourceLineNo">212</span>                                              " received: " + error.getMessage());<a name="line.212"></a>
<span class="sourceLineNo">213</span>                    case TFTPPacket.DATA:<a name="line.213"></a>
<span class="sourceLineNo">214</span>                        data = (TFTPDataPacket)received;<a name="line.214"></a>
<span class="sourceLineNo">215</span>                        dataLength = data.getDataLength();<a name="line.215"></a>
<span class="sourceLineNo">216</span><a name="line.216"></a>
<span class="sourceLineNo">217</span>                        lastBlock = data.getBlockNumber();<a name="line.217"></a>
<span class="sourceLineNo">218</span><a name="line.218"></a>
<span class="sourceLineNo">219</span>                        if (lastBlock == block)<a name="line.219"></a>
<span class="sourceLineNo">220</span>                        {<a name="line.220"></a>
<span class="sourceLineNo">221</span>                            try<a name="line.221"></a>
<span class="sourceLineNo">222</span>                            {<a name="line.222"></a>
<span class="sourceLineNo">223</span>                                output.write(data.getData(), data.getDataOffset(),<a name="line.223"></a>
<span class="sourceLineNo">224</span>                                             dataLength);<a name="line.224"></a>
<span class="sourceLineNo">225</span>                            }<a name="line.225"></a>
<span class="sourceLineNo">226</span>                            catch (IOException e)<a name="line.226"></a>
<span class="sourceLineNo">227</span>                            {<a name="line.227"></a>
<span class="sourceLineNo">228</span>                                error = new TFTPErrorPacket(host, hostPort,<a name="line.228"></a>
<span class="sourceLineNo">229</span>                                                            TFTPErrorPacket.OUT_OF_SPACE,<a name="line.229"></a>
<span class="sourceLineNo">230</span>                                                            "File write failed.");<a name="line.230"></a>
<span class="sourceLineNo">231</span>                                bufferedSend(error);<a name="line.231"></a>
<span class="sourceLineNo">232</span>                                endBufferedOps();<a name="line.232"></a>
<span class="sourceLineNo">233</span>                                throw e;<a name="line.233"></a>
<span class="sourceLineNo">234</span>                            }<a name="line.234"></a>
<span class="sourceLineNo">235</span>                            ++block;<a name="line.235"></a>
<span class="sourceLineNo">236</span>                            if (block &gt; 65535)<a name="line.236"></a>
<span class="sourceLineNo">237</span>                            {<a name="line.237"></a>
<span class="sourceLineNo">238</span>                                // wrap the block number<a name="line.238"></a>
<span class="sourceLineNo">239</span>                                block = 0;<a name="line.239"></a>
<span class="sourceLineNo">240</span>                            }<a name="line.240"></a>
<span class="sourceLineNo">241</span><a name="line.241"></a>
<span class="sourceLineNo">242</span>                            break _receivePacket;<a name="line.242"></a>
<span class="sourceLineNo">243</span>                        }<a name="line.243"></a>
<span class="sourceLineNo">244</span>                        else<a name="line.244"></a>
<span class="sourceLineNo">245</span>                        {<a name="line.245"></a>
<span class="sourceLineNo">246</span>                            discardPackets();<a name="line.246"></a>
<span class="sourceLineNo">247</span><a name="line.247"></a>
<span class="sourceLineNo">248</span>                            if (lastBlock == (block == 0 ? 65535 : (block - 1))) {<a name="line.248"></a>
<span class="sourceLineNo">249</span>                                continue _sendPacket;  // Resend last acknowledgement.<a name="line.249"></a>
<span class="sourceLineNo">250</span>                            }<a name="line.250"></a>
<span class="sourceLineNo">251</span><a name="line.251"></a>
<span class="sourceLineNo">252</span>                            continue _receivePacket; // Start fetching packets again.<a name="line.252"></a>
<span class="sourceLineNo">253</span>                        }<a name="line.253"></a>
<span class="sourceLineNo">254</span>                        //break;<a name="line.254"></a>
<span class="sourceLineNo">255</span><a name="line.255"></a>
<span class="sourceLineNo">256</span>                    default:<a name="line.256"></a>
<span class="sourceLineNo">257</span>                        endBufferedOps();<a name="line.257"></a>
<span class="sourceLineNo">258</span>                        throw new IOException("Received unexpected packet type.");<a name="line.258"></a>
<span class="sourceLineNo">259</span>                    }<a name="line.259"></a>
<span class="sourceLineNo">260</span>                }<a name="line.260"></a>
<span class="sourceLineNo">261</span>                else<a name="line.261"></a>
<span class="sourceLineNo">262</span>                {<a name="line.262"></a>
<span class="sourceLineNo">263</span>                    error = new TFTPErrorPacket(received.getAddress(),<a name="line.263"></a>
<span class="sourceLineNo">264</span>                                                received.getPort(),<a name="line.264"></a>
<span class="sourceLineNo">265</span>                                                TFTPErrorPacket.UNKNOWN_TID,<a name="line.265"></a>
<span class="sourceLineNo">266</span>                                                "Unexpected host or port.");<a name="line.266"></a>
<span class="sourceLineNo">267</span>                    bufferedSend(error);<a name="line.267"></a>
<span class="sourceLineNo">268</span>                    continue _sendPacket;<a name="line.268"></a>
<span class="sourceLineNo">269</span>                }<a name="line.269"></a>
<span class="sourceLineNo">270</span><a name="line.270"></a>
<span class="sourceLineNo">271</span>                // We should never get here, but this is a safety to avoid<a name="line.271"></a>
<span class="sourceLineNo">272</span>                // infinite loop.  If only Java had the goto statement.<a name="line.272"></a>
<span class="sourceLineNo">273</span>                //break;<a name="line.273"></a>
<span class="sourceLineNo">274</span>            }<a name="line.274"></a>
<span class="sourceLineNo">275</span><a name="line.275"></a>
<span class="sourceLineNo">276</span>            ack.setBlockNumber(lastBlock);<a name="line.276"></a>
<span class="sourceLineNo">277</span>            sent = ack;<a name="line.277"></a>
<span class="sourceLineNo">278</span>            bytesRead += dataLength;<a name="line.278"></a>
<span class="sourceLineNo">279</span>        } // First data packet less than 512 bytes signals end of stream.<a name="line.279"></a>
<span class="sourceLineNo">280</span><a name="line.280"></a>
<span class="sourceLineNo">281</span>        while (dataLength == TFTPPacket.SEGMENT_SIZE);<a name="line.281"></a>
<span class="sourceLineNo">282</span><a name="line.282"></a>
<span class="sourceLineNo">283</span>        bufferedSend(sent);<a name="line.283"></a>
<span class="sourceLineNo">284</span>        endBufferedOps();<a name="line.284"></a>
<span class="sourceLineNo">285</span><a name="line.285"></a>
<span class="sourceLineNo">286</span>        return bytesRead;<a name="line.286"></a>
<span class="sourceLineNo">287</span>    }<a name="line.287"></a>
<span class="sourceLineNo">288</span><a name="line.288"></a>
<span class="sourceLineNo">289</span><a name="line.289"></a>
<span class="sourceLineNo">290</span>    /***<a name="line.290"></a>
<span class="sourceLineNo">291</span>     * Requests a named file from a remote host, writes the<a name="line.291"></a>
<span class="sourceLineNo">292</span>     * file to an OutputStream, closes the connection, and returns the number<a name="line.292"></a>
<span class="sourceLineNo">293</span>     * of bytes read.  A local UDP socket must first be created by<a name="line.293"></a>
<span class="sourceLineNo">294</span>     * {@link org.apache.commons.net.DatagramSocketClient#open open()} before<a name="line.294"></a>
<span class="sourceLineNo">295</span>     * invoking this method.  This method will not close the OutputStream<a name="line.295"></a>
<span class="sourceLineNo">296</span>     * containing the file; you must close it after the method invocation.<a name="line.296"></a>
<span class="sourceLineNo">297</span>     * &lt;p&gt;<a name="line.297"></a>
<span class="sourceLineNo">298</span>     * @param filename The name of the file to receive.<a name="line.298"></a>
<span class="sourceLineNo">299</span>     * @param mode     The TFTP mode of the transfer (one of the MODE constants).<a name="line.299"></a>
<span class="sourceLineNo">300</span>     * @param output   The OutputStream to which the file should be written.<a name="line.300"></a>
<span class="sourceLineNo">301</span>     * @param hostname The name of the remote host serving the file.<a name="line.301"></a>
<span class="sourceLineNo">302</span>     * @param port     The port number of the remote TFTP server.<a name="line.302"></a>
<span class="sourceLineNo">303</span>     * @exception IOException If an I/O error occurs.  The nature of the<a name="line.303"></a>
<span class="sourceLineNo">304</span>     *            error will be reported in the message.<a name="line.304"></a>
<span class="sourceLineNo">305</span>     * @exception UnknownHostException  If the hostname cannot be resolved.<a name="line.305"></a>
<span class="sourceLineNo">306</span>     ***/<a name="line.306"></a>
<span class="sourceLineNo">307</span>    public int receiveFile(String filename, int mode, OutputStream output,<a name="line.307"></a>
<span class="sourceLineNo">308</span>                           String hostname, int port)<a name="line.308"></a>
<span class="sourceLineNo">309</span>    throws UnknownHostException, IOException<a name="line.309"></a>
<span class="sourceLineNo">310</span>    {<a name="line.310"></a>
<span class="sourceLineNo">311</span>        return receiveFile(filename, mode, output, InetAddress.getByName(hostname),<a name="line.311"></a>
<span class="sourceLineNo">312</span>                           port);<a name="line.312"></a>
<span class="sourceLineNo">313</span>    }<a name="line.313"></a>
<span class="sourceLineNo">314</span><a name="line.314"></a>
<span class="sourceLineNo">315</span><a name="line.315"></a>
<span class="sourceLineNo">316</span>    /***<a name="line.316"></a>
<span class="sourceLineNo">317</span>     * Same as calling receiveFile(filename, mode, output, host, TFTP.DEFAULT_PORT).<a name="line.317"></a>
<span class="sourceLineNo">318</span>     *<a name="line.318"></a>
<span class="sourceLineNo">319</span>     * @param filename The name of the file to receive.<a name="line.319"></a>
<span class="sourceLineNo">320</span>     * @param mode     The TFTP mode of the transfer (one of the MODE constants).<a name="line.320"></a>
<span class="sourceLineNo">321</span>     * @param output   The OutputStream to which the file should be written.<a name="line.321"></a>
<span class="sourceLineNo">322</span>     * @param host     The remote host serving the file.<a name="line.322"></a>
<span class="sourceLineNo">323</span>     * @exception IOException If an I/O error occurs.  The nature of the<a name="line.323"></a>
<span class="sourceLineNo">324</span>     *            error will be reported in the message.<a name="line.324"></a>
<span class="sourceLineNo">325</span>     ***/<a name="line.325"></a>
<span class="sourceLineNo">326</span>    public int receiveFile(String filename, int mode, OutputStream output,<a name="line.326"></a>
<span class="sourceLineNo">327</span>                           InetAddress host)<a name="line.327"></a>
<span class="sourceLineNo">328</span>    throws IOException<a name="line.328"></a>
<span class="sourceLineNo">329</span>    {<a name="line.329"></a>
<span class="sourceLineNo">330</span>        return receiveFile(filename, mode, output, host, DEFAULT_PORT);<a name="line.330"></a>
<span class="sourceLineNo">331</span>    }<a name="line.331"></a>
<span class="sourceLineNo">332</span><a name="line.332"></a>
<span class="sourceLineNo">333</span>    /***<a name="line.333"></a>
<span class="sourceLineNo">334</span>     * Same as calling receiveFile(filename, mode, output, hostname, TFTP.DEFAULT_PORT).<a name="line.334"></a>
<span class="sourceLineNo">335</span>     *<a name="line.335"></a>
<span class="sourceLineNo">336</span>     * @param filename The name of the file to receive.<a name="line.336"></a>
<span class="sourceLineNo">337</span>     * @param mode     The TFTP mode of the transfer (one of the MODE constants).<a name="line.337"></a>
<span class="sourceLineNo">338</span>     * @param output   The OutputStream to which the file should be written.<a name="line.338"></a>
<span class="sourceLineNo">339</span>     * @param hostname The name of the remote host serving the file.<a name="line.339"></a>
<span class="sourceLineNo">340</span>     * @exception IOException If an I/O error occurs.  The nature of the<a name="line.340"></a>
<span class="sourceLineNo">341</span>     *            error will be reported in the message.<a name="line.341"></a>
<span class="sourceLineNo">342</span>     * @exception UnknownHostException  If the hostname cannot be resolved.<a name="line.342"></a>
<span class="sourceLineNo">343</span>     ***/<a name="line.343"></a>
<span class="sourceLineNo">344</span>    public int receiveFile(String filename, int mode, OutputStream output,<a name="line.344"></a>
<span class="sourceLineNo">345</span>                           String hostname)<a name="line.345"></a>
<span class="sourceLineNo">346</span>    throws UnknownHostException, IOException<a name="line.346"></a>
<span class="sourceLineNo">347</span>    {<a name="line.347"></a>
<span class="sourceLineNo">348</span>        return receiveFile(filename, mode, output, InetAddress.getByName(hostname),<a name="line.348"></a>
<span class="sourceLineNo">349</span>                           DEFAULT_PORT);<a name="line.349"></a>
<span class="sourceLineNo">350</span>    }<a name="line.350"></a>
<span class="sourceLineNo">351</span><a name="line.351"></a>
<span class="sourceLineNo">352</span><a name="line.352"></a>
<span class="sourceLineNo">353</span>    /***<a name="line.353"></a>
<span class="sourceLineNo">354</span>     * Requests to send a file to a remote host, reads the file from an<a name="line.354"></a>
<span class="sourceLineNo">355</span>     * InputStream, sends the file to the remote host, and closes the<a name="line.355"></a>
<span class="sourceLineNo">356</span>     * connection.  A local UDP socket must first be created by<a name="line.356"></a>
<span class="sourceLineNo">357</span>     * {@link org.apache.commons.net.DatagramSocketClient#open open()} before<a name="line.357"></a>
<span class="sourceLineNo">358</span>     * invoking this method.  This method will not close the InputStream<a name="line.358"></a>
<span class="sourceLineNo">359</span>     * containing the file; you must close it after the method invocation.<a name="line.359"></a>
<span class="sourceLineNo">360</span>     * &lt;p&gt;<a name="line.360"></a>
<span class="sourceLineNo">361</span>     * @param filename The name the remote server should use when creating<a name="line.361"></a>
<span class="sourceLineNo">362</span>     *        the file on its file system.<a name="line.362"></a>
<span class="sourceLineNo">363</span>     * @param mode     The TFTP mode of the transfer (one of the MODE constants).<a name="line.363"></a>
<span class="sourceLineNo">364</span>     * @param host     The remote host receiving the file.<a name="line.364"></a>
<span class="sourceLineNo">365</span>     * @param port     The port number of the remote TFTP server.<a name="line.365"></a>
<span class="sourceLineNo">366</span>     * @exception IOException If an I/O error occurs.  The nature of the<a name="line.366"></a>
<span class="sourceLineNo">367</span>     *            error will be reported in the message.<a name="line.367"></a>
<span class="sourceLineNo">368</span>     ***/<a name="line.368"></a>
<span class="sourceLineNo">369</span>    public void sendFile(String filename, int mode, InputStream input,<a name="line.369"></a>
<span class="sourceLineNo">370</span>                         InetAddress host, int port) throws IOException<a name="line.370"></a>
<span class="sourceLineNo">371</span>    {<a name="line.371"></a>
<span class="sourceLineNo">372</span>        int bytesRead, timeouts, lastBlock, block, hostPort, dataLength, offset, totalThisPacket;<a name="line.372"></a>
<span class="sourceLineNo">373</span>        TFTPPacket sent, received = null;<a name="line.373"></a>
<span class="sourceLineNo">374</span>        TFTPErrorPacket error;<a name="line.374"></a>
<span class="sourceLineNo">375</span>        TFTPDataPacket data =<a name="line.375"></a>
<span class="sourceLineNo">376</span>            new TFTPDataPacket(host, port, 0, _sendBuffer, 4, 0);<a name="line.376"></a>
<span class="sourceLineNo">377</span>        TFTPAckPacket ack;<a name="line.377"></a>
<span class="sourceLineNo">378</span><a name="line.378"></a>
<span class="sourceLineNo">379</span>        boolean justStarted = true;<a name="line.379"></a>
<span class="sourceLineNo">380</span><a name="line.380"></a>
<span class="sourceLineNo">381</span>        beginBufferedOps();<a name="line.381"></a>
<span class="sourceLineNo">382</span><a name="line.382"></a>
<span class="sourceLineNo">383</span>        dataLength = lastBlock = hostPort = bytesRead = totalThisPacket = 0;<a name="line.383"></a>
<span class="sourceLineNo">384</span>        block = 0;<a name="line.384"></a>
<span class="sourceLineNo">385</span>        boolean lastAckWait = false;<a name="line.385"></a>
<span class="sourceLineNo">386</span><a name="line.386"></a>
<span class="sourceLineNo">387</span>        if (mode == TFTP.ASCII_MODE) {<a name="line.387"></a>
<span class="sourceLineNo">388</span>            input = new ToNetASCIIInputStream(input);<a name="line.388"></a>
<span class="sourceLineNo">389</span>        }<a name="line.389"></a>
<span class="sourceLineNo">390</span><a name="line.390"></a>
<span class="sourceLineNo">391</span>        sent =<a name="line.391"></a>
<span class="sourceLineNo">392</span>            new TFTPWriteRequestPacket(host, port, filename, mode);<a name="line.392"></a>
<span class="sourceLineNo">393</span><a name="line.393"></a>
<span class="sourceLineNo">394</span>_sendPacket:<a name="line.394"></a>
<span class="sourceLineNo">395</span>        do<a name="line.395"></a>
<span class="sourceLineNo">396</span>        {<a name="line.396"></a>
<span class="sourceLineNo">397</span>            // first time: block is 0, lastBlock is 0, send a request packet.<a name="line.397"></a>
<span class="sourceLineNo">398</span>            // subsequent: block is integer starting at 1, send data packet.<a name="line.398"></a>
<span class="sourceLineNo">399</span>            bufferedSend(sent);<a name="line.399"></a>
<span class="sourceLineNo">400</span><a name="line.400"></a>
<span class="sourceLineNo">401</span>            // this is trying to receive an ACK<a name="line.401"></a>
<span class="sourceLineNo">402</span>_receivePacket:<a name="line.402"></a>
<span class="sourceLineNo">403</span>            while (true)<a name="line.403"></a>
<span class="sourceLineNo">404</span>            {<a name="line.404"></a>
<span class="sourceLineNo">405</span><a name="line.405"></a>
<span class="sourceLineNo">406</span><a name="line.406"></a>
<span class="sourceLineNo">407</span>                timeouts = 0;<a name="line.407"></a>
<span class="sourceLineNo">408</span>                do {<a name="line.408"></a>
<span class="sourceLineNo">409</span>                    try<a name="line.409"></a>
<span class="sourceLineNo">410</span>                    {<a name="line.410"></a>
<span class="sourceLineNo">411</span>                        received = bufferedReceive();<a name="line.411"></a>
<span class="sourceLineNo">412</span>                        break;<a name="line.412"></a>
<span class="sourceLineNo">413</span>                    }<a name="line.413"></a>
<span class="sourceLineNo">414</span>                    catch (SocketException e)<a name="line.414"></a>
<span class="sourceLineNo">415</span>                    {<a name="line.415"></a>
<span class="sourceLineNo">416</span>                        if (++timeouts &gt;= __maxTimeouts)<a name="line.416"></a>
<span class="sourceLineNo">417</span>                        {<a name="line.417"></a>
<span class="sourceLineNo">418</span>                            endBufferedOps();<a name="line.418"></a>
<span class="sourceLineNo">419</span>                            throw new IOException("Connection timed out.");<a name="line.419"></a>
<span class="sourceLineNo">420</span>                        }<a name="line.420"></a>
<span class="sourceLineNo">421</span>                        continue _sendPacket;<a name="line.421"></a>
<span class="sourceLineNo">422</span>                    }<a name="line.422"></a>
<span class="sourceLineNo">423</span>                    catch (InterruptedIOException e)<a name="line.423"></a>
<span class="sourceLineNo">424</span>                    {<a name="line.424"></a>
<span class="sourceLineNo">425</span>                        if (++timeouts &gt;= __maxTimeouts)<a name="line.425"></a>
<span class="sourceLineNo">426</span>                        {<a name="line.426"></a>
<span class="sourceLineNo">427</span>                            endBufferedOps();<a name="line.427"></a>
<span class="sourceLineNo">428</span>                            throw new IOException("Connection timed out.");<a name="line.428"></a>
<span class="sourceLineNo">429</span>                        }<a name="line.429"></a>
<span class="sourceLineNo">430</span>                        continue _sendPacket;<a name="line.430"></a>
<span class="sourceLineNo">431</span>                    }<a name="line.431"></a>
<span class="sourceLineNo">432</span>                    catch (TFTPPacketException e)<a name="line.432"></a>
<span class="sourceLineNo">433</span>                    {<a name="line.433"></a>
<span class="sourceLineNo">434</span>                        endBufferedOps();<a name="line.434"></a>
<span class="sourceLineNo">435</span>                        throw new IOException("Bad packet: " + e.getMessage());<a name="line.435"></a>
<span class="sourceLineNo">436</span>                    }<a name="line.436"></a>
<span class="sourceLineNo">437</span>                } // end of while loop over tries to receive<a name="line.437"></a>
<span class="sourceLineNo">438</span>                while (timeouts &lt; __maxTimeouts); // __maxTimeouts &gt;=1 so will always do loop at least once<a name="line.438"></a>
<span class="sourceLineNo">439</span><a name="line.439"></a>
<span class="sourceLineNo">440</span><a name="line.440"></a>
<span class="sourceLineNo">441</span>                // The first time we receive we get the port number and<a name="line.441"></a>
<span class="sourceLineNo">442</span>                // answering host address (for hosts with multiple IPs)<a name="line.442"></a>
<span class="sourceLineNo">443</span>                if (justStarted)<a name="line.443"></a>
<span class="sourceLineNo">444</span>                {<a name="line.444"></a>
<span class="sourceLineNo">445</span>                    justStarted = false;<a name="line.445"></a>
<span class="sourceLineNo">446</span>                    hostPort = received.getPort();<a name="line.446"></a>
<span class="sourceLineNo">447</span>                    data.setPort(hostPort);<a name="line.447"></a>
<span class="sourceLineNo">448</span>                    if(!host.equals(received.getAddress()))<a name="line.448"></a>
<span class="sourceLineNo">449</span>                    {<a name="line.449"></a>
<span class="sourceLineNo">450</span>                        host = received.getAddress();<a name="line.450"></a>
<span class="sourceLineNo">451</span>                        data.setAddress(host);<a name="line.451"></a>
<span class="sourceLineNo">452</span>                        sent.setAddress(host);<a name="line.452"></a>
<span class="sourceLineNo">453</span>                    }<a name="line.453"></a>
<span class="sourceLineNo">454</span>                }<a name="line.454"></a>
<span class="sourceLineNo">455</span><a name="line.455"></a>
<span class="sourceLineNo">456</span>                // Comply with RFC 783 indication that an error acknowledgment<a name="line.456"></a>
<span class="sourceLineNo">457</span>                // should be sent to originator if unexpected TID or host.<a name="line.457"></a>
<span class="sourceLineNo">458</span>                if (host.equals(received.getAddress()) &amp;&amp;<a name="line.458"></a>
<span class="sourceLineNo">459</span>                        received.getPort() == hostPort)<a name="line.459"></a>
<span class="sourceLineNo">460</span>                {<a name="line.460"></a>
<span class="sourceLineNo">461</span><a name="line.461"></a>
<span class="sourceLineNo">462</span>                    switch (received.getType())<a name="line.462"></a>
<span class="sourceLineNo">463</span>                    {<a name="line.463"></a>
<span class="sourceLineNo">464</span>                    case TFTPPacket.ERROR:<a name="line.464"></a>
<span class="sourceLineNo">465</span>                        error = (TFTPErrorPacket)received;<a name="line.465"></a>
<span class="sourceLineNo">466</span>                        endBufferedOps();<a name="line.466"></a>
<span class="sourceLineNo">467</span>                        throw new IOException("Error code " + error.getError() +<a name="line.467"></a>
<span class="sourceLineNo">468</span>                                              " received: " + error.getMessage());<a name="line.468"></a>
<span class="sourceLineNo">469</span>                    case TFTPPacket.ACKNOWLEDGEMENT:<a name="line.469"></a>
<span class="sourceLineNo">470</span>                        ack = (TFTPAckPacket)received;<a name="line.470"></a>
<span class="sourceLineNo">471</span><a name="line.471"></a>
<span class="sourceLineNo">472</span>                        lastBlock = ack.getBlockNumber();<a name="line.472"></a>
<span class="sourceLineNo">473</span><a name="line.473"></a>
<span class="sourceLineNo">474</span>                        if (lastBlock == block)<a name="line.474"></a>
<span class="sourceLineNo">475</span>                        {<a name="line.475"></a>
<span class="sourceLineNo">476</span>                            ++block;<a name="line.476"></a>
<span class="sourceLineNo">477</span>                            if (block &gt; 65535)<a name="line.477"></a>
<span class="sourceLineNo">478</span>                            {<a name="line.478"></a>
<span class="sourceLineNo">479</span>                                // wrap the block number<a name="line.479"></a>
<span class="sourceLineNo">480</span>                                block = 0;<a name="line.480"></a>
<span class="sourceLineNo">481</span>                            }<a name="line.481"></a>
<span class="sourceLineNo">482</span>                            if (lastAckWait) {<a name="line.482"></a>
<span class="sourceLineNo">483</span><a name="line.483"></a>
<span class="sourceLineNo">484</span>                              break _sendPacket;<a name="line.484"></a>
<span class="sourceLineNo">485</span>                            }<a name="line.485"></a>
<span class="sourceLineNo">486</span>                            else {<a name="line.486"></a>
<span class="sourceLineNo">487</span>                              break _receivePacket;<a name="line.487"></a>
<span class="sourceLineNo">488</span>                            }<a name="line.488"></a>
<span class="sourceLineNo">489</span>                        }<a name="line.489"></a>
<span class="sourceLineNo">490</span>                        else<a name="line.490"></a>
<span class="sourceLineNo">491</span>                        {<a name="line.491"></a>
<span class="sourceLineNo">492</span>                            discardPackets();<a name="line.492"></a>
<span class="sourceLineNo">493</span><a name="line.493"></a>
<span class="sourceLineNo">494</span>                            continue _receivePacket; // Start fetching packets again.<a name="line.494"></a>
<span class="sourceLineNo">495</span>                        }<a name="line.495"></a>
<span class="sourceLineNo">496</span>                        //break;<a name="line.496"></a>
<span class="sourceLineNo">497</span><a name="line.497"></a>
<span class="sourceLineNo">498</span>                    default:<a name="line.498"></a>
<span class="sourceLineNo">499</span>                        endBufferedOps();<a name="line.499"></a>
<span class="sourceLineNo">500</span>                        throw new IOException("Received unexpected packet type.");<a name="line.500"></a>
<span class="sourceLineNo">501</span>                    }<a name="line.501"></a>
<span class="sourceLineNo">502</span>                }<a name="line.502"></a>
<span class="sourceLineNo">503</span>                else<a name="line.503"></a>
<span class="sourceLineNo">504</span>                {<a name="line.504"></a>
<span class="sourceLineNo">505</span>                    error = new TFTPErrorPacket(received.getAddress(),<a name="line.505"></a>
<span class="sourceLineNo">506</span>                                                received.getPort(),<a name="line.506"></a>
<span class="sourceLineNo">507</span>                                                TFTPErrorPacket.UNKNOWN_TID,<a name="line.507"></a>
<span class="sourceLineNo">508</span>                                                "Unexpected host or port.");<a name="line.508"></a>
<span class="sourceLineNo">509</span>                    bufferedSend(error);<a name="line.509"></a>
<span class="sourceLineNo">510</span>                    continue _sendPacket;<a name="line.510"></a>
<span class="sourceLineNo">511</span>                }<a name="line.511"></a>
<span class="sourceLineNo">512</span><a name="line.512"></a>
<span class="sourceLineNo">513</span>                // We should never get here, but this is a safety to avoid<a name="line.513"></a>
<span class="sourceLineNo">514</span>                // infinite loop.  If only Java had the goto statement.<a name="line.514"></a>
<span class="sourceLineNo">515</span>                //break;<a name="line.515"></a>
<span class="sourceLineNo">516</span>            }<a name="line.516"></a>
<span class="sourceLineNo">517</span><a name="line.517"></a>
<span class="sourceLineNo">518</span>            // OK, we have just gotten ACK about the last data we sent. Make another<a name="line.518"></a>
<span class="sourceLineNo">519</span>            // and send it<a name="line.519"></a>
<span class="sourceLineNo">520</span><a name="line.520"></a>
<span class="sourceLineNo">521</span>            dataLength = TFTPPacket.SEGMENT_SIZE;<a name="line.521"></a>
<span class="sourceLineNo">522</span>            offset = 4;<a name="line.522"></a>
<span class="sourceLineNo">523</span>            totalThisPacket = 0;<a name="line.523"></a>
<span class="sourceLineNo">524</span>            while (dataLength &gt; 0 &amp;&amp;<a name="line.524"></a>
<span class="sourceLineNo">525</span>                    (bytesRead = input.read(_sendBuffer, offset, dataLength)) &gt; 0)<a name="line.525"></a>
<span class="sourceLineNo">526</span>            {<a name="line.526"></a>
<span class="sourceLineNo">527</span>                offset += bytesRead;<a name="line.527"></a>
<span class="sourceLineNo">528</span>                dataLength -= bytesRead;<a name="line.528"></a>
<span class="sourceLineNo">529</span>                totalThisPacket += bytesRead;<a name="line.529"></a>
<span class="sourceLineNo">530</span>            }<a name="line.530"></a>
<span class="sourceLineNo">531</span><a name="line.531"></a>
<span class="sourceLineNo">532</span>            if( totalThisPacket &lt; TFTPPacket.SEGMENT_SIZE ) {<a name="line.532"></a>
<span class="sourceLineNo">533</span>                /* this will be our last packet -- send, wait for ack, stop */<a name="line.533"></a>
<span class="sourceLineNo">534</span>                lastAckWait = true;<a name="line.534"></a>
<span class="sourceLineNo">535</span>            }<a name="line.535"></a>
<span class="sourceLineNo">536</span>            data.setBlockNumber(block);<a name="line.536"></a>
<span class="sourceLineNo">537</span>            data.setData(_sendBuffer, 4, totalThisPacket);<a name="line.537"></a>
<span class="sourceLineNo">538</span>            sent = data;<a name="line.538"></a>
<span class="sourceLineNo">539</span>        }<a name="line.539"></a>
<span class="sourceLineNo">540</span>        while ( totalThisPacket &gt; 0 || lastAckWait );<a name="line.540"></a>
<span class="sourceLineNo">541</span>        // Note: this was looping while dataLength == 0 || lastAckWait,<a name="line.541"></a>
<span class="sourceLineNo">542</span>        // which was discarding the last packet if it was not full size<a name="line.542"></a>
<span class="sourceLineNo">543</span>        // Should send the packet.<a name="line.543"></a>
<span class="sourceLineNo">544</span><a name="line.544"></a>
<span class="sourceLineNo">545</span>        endBufferedOps();<a name="line.545"></a>
<span class="sourceLineNo">546</span>    }<a name="line.546"></a>
<span class="sourceLineNo">547</span><a name="line.547"></a>
<span class="sourceLineNo">548</span><a name="line.548"></a>
<span class="sourceLineNo">549</span>    /***<a name="line.549"></a>
<span class="sourceLineNo">550</span>     * Requests to send a file to a remote host, reads the file from an<a name="line.550"></a>
<span class="sourceLineNo">551</span>     * InputStream, sends the file to the remote host, and closes the<a name="line.551"></a>
<span class="sourceLineNo">552</span>     * connection.  A local UDP socket must first be created by<a name="line.552"></a>
<span class="sourceLineNo">553</span>     * {@link org.apache.commons.net.DatagramSocketClient#open open()} before<a name="line.553"></a>
<span class="sourceLineNo">554</span>     * invoking this method.  This method will not close the InputStream<a name="line.554"></a>
<span class="sourceLineNo">555</span>     * containing the file; you must close it after the method invocation.<a name="line.555"></a>
<span class="sourceLineNo">556</span>     * &lt;p&gt;<a name="line.556"></a>
<span class="sourceLineNo">557</span>     * @param filename The name the remote server should use when creating<a name="line.557"></a>
<span class="sourceLineNo">558</span>     *        the file on its file system.<a name="line.558"></a>
<span class="sourceLineNo">559</span>     * @param mode     The TFTP mode of the transfer (one of the MODE constants).<a name="line.559"></a>
<span class="sourceLineNo">560</span>     * @param hostname The name of the remote host receiving the file.<a name="line.560"></a>
<span class="sourceLineNo">561</span>     * @param port     The port number of the remote TFTP server.<a name="line.561"></a>
<span class="sourceLineNo">562</span>     * @exception IOException If an I/O error occurs.  The nature of the<a name="line.562"></a>
<span class="sourceLineNo">563</span>     *            error will be reported in the message.<a name="line.563"></a>
<span class="sourceLineNo">564</span>     * @exception UnknownHostException  If the hostname cannot be resolved.<a name="line.564"></a>
<span class="sourceLineNo">565</span>     ***/<a name="line.565"></a>
<span class="sourceLineNo">566</span>    public void sendFile(String filename, int mode, InputStream input,<a name="line.566"></a>
<span class="sourceLineNo">567</span>                         String hostname, int port)<a name="line.567"></a>
<span class="sourceLineNo">568</span>    throws UnknownHostException, IOException<a name="line.568"></a>
<span class="sourceLineNo">569</span>    {<a name="line.569"></a>
<span class="sourceLineNo">570</span>        sendFile(filename, mode, input, InetAddress.getByName(hostname), port);<a name="line.570"></a>
<span class="sourceLineNo">571</span>    }<a name="line.571"></a>
<span class="sourceLineNo">572</span><a name="line.572"></a>
<span class="sourceLineNo">573</span><a name="line.573"></a>
<span class="sourceLineNo">574</span>    /***<a name="line.574"></a>
<span class="sourceLineNo">575</span>     * Same as calling sendFile(filename, mode, input, host, TFTP.DEFAULT_PORT).<a name="line.575"></a>
<span class="sourceLineNo">576</span>     *<a name="line.576"></a>
<span class="sourceLineNo">577</span>     * @param filename The name the remote server should use when creating<a name="line.577"></a>
<span class="sourceLineNo">578</span>     *        the file on its file system.<a name="line.578"></a>
<span class="sourceLineNo">579</span>     * @param mode     The TFTP mode of the transfer (one of the MODE constants).<a name="line.579"></a>
<span class="sourceLineNo">580</span>     * @param host     The name of the remote host receiving the file.<a name="line.580"></a>
<span class="sourceLineNo">581</span>     * @exception IOException If an I/O error occurs.  The nature of the<a name="line.581"></a>
<span class="sourceLineNo">582</span>     *            error will be reported in the message.<a name="line.582"></a>
<span class="sourceLineNo">583</span>     * @exception UnknownHostException  If the hostname cannot be resolved.<a name="line.583"></a>
<span class="sourceLineNo">584</span>     ***/<a name="line.584"></a>
<span class="sourceLineNo">585</span>    public void sendFile(String filename, int mode, InputStream input,<a name="line.585"></a>
<span class="sourceLineNo">586</span>                         InetAddress host)<a name="line.586"></a>
<span class="sourceLineNo">587</span>    throws IOException<a name="line.587"></a>
<span class="sourceLineNo">588</span>    {<a name="line.588"></a>
<span class="sourceLineNo">589</span>        sendFile(filename, mode, input, host, DEFAULT_PORT);<a name="line.589"></a>
<span class="sourceLineNo">590</span>    }<a name="line.590"></a>
<span class="sourceLineNo">591</span><a name="line.591"></a>
<span class="sourceLineNo">592</span>    /***<a name="line.592"></a>
<span class="sourceLineNo">593</span>     * Same as calling sendFile(filename, mode, input, hostname, TFTP.DEFAULT_PORT).<a name="line.593"></a>
<span class="sourceLineNo">594</span>     *<a name="line.594"></a>
<span class="sourceLineNo">595</span>     * @param filename The name the remote server should use when creating<a name="line.595"></a>
<span class="sourceLineNo">596</span>     *        the file on its file system.<a name="line.596"></a>
<span class="sourceLineNo">597</span>     * @param mode     The TFTP mode of the transfer (one of the MODE constants).<a name="line.597"></a>
<span class="sourceLineNo">598</span>     * @param hostname The name of the remote host receiving the file.<a name="line.598"></a>
<span class="sourceLineNo">599</span>     * @exception IOException If an I/O error occurs.  The nature of the<a name="line.599"></a>
<span class="sourceLineNo">600</span>     *            error will be reported in the message.<a name="line.600"></a>
<span class="sourceLineNo">601</span>     * @exception UnknownHostException  If the hostname cannot be resolved.<a name="line.601"></a>
<span class="sourceLineNo">602</span>     ***/<a name="line.602"></a>
<span class="sourceLineNo">603</span>    public void sendFile(String filename, int mode, InputStream input,<a name="line.603"></a>
<span class="sourceLineNo">604</span>                         String hostname)<a name="line.604"></a>
<span class="sourceLineNo">605</span>    throws UnknownHostException, IOException<a name="line.605"></a>
<span class="sourceLineNo">606</span>    {<a name="line.606"></a>
<span class="sourceLineNo">607</span>        sendFile(filename, mode, input, InetAddress.getByName(hostname),<a name="line.607"></a>
<span class="sourceLineNo">608</span>                 DEFAULT_PORT);<a name="line.608"></a>
<span class="sourceLineNo">609</span>    }<a name="line.609"></a>
<span class="sourceLineNo">610</span>}<a name="line.610"></a>




























































</pre>
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